JP7330571B1 - Helmet heat shield structure - Google Patents

Abstract

[Problem] To provide a heat shield for a helmet that prevents heat from entering the inside of a helmet cap body and further ventilates the inside of the helmet cap body, thereby preventing heatstroke even in summer and preventing the head from getting stuffy. Provide structure. A heat shield structure 10 for a helmet includes a helmet cap body 1 having an exhaust port 3 formed in the rear, an inner cap 2 having a plurality of through holes 7 formed therein, and a helmet cap body 1 and an inner cap 2. A plurality of air intakes 8 are formed between the helmet cap body 1 and the inner cap 2, and a ventilation belt is provided between the inner cap 2 and the helmet cap body 1. is formed, and the air sucked from the intake port 8 and the air sucked from the through hole 7 are discharged from the exhaust port 3 through the ventilation belt. [Selection drawing] Fig. 4

Description

Application of Article 30, Paragraph 2 of the Patent Law Announced at the manufacturing company exhibition and business meeting 2022 on December 7, 2022

To provide a heat shielding structure for a helmet that prevents heatstroke even in summer and keeps the head from getting stuffy by blocking radiant heat radiating to the head through the helmet cap body and ventilating the inside of the helmet cap body. .

Conventionally, helmets with a heat-shielding coating on the surface, materials with reflective properties (such as glass beads and titanium oxide) kneaded into the material of the helmet cap, and heat-shielding materials provided inside. Hats and the like have been disclosed (for example, Patent Document 1).

Japanese Patent No. 6840417

A helmet with a heat-shielding coating is used. In order to block the radiant heat from the sun, which has the highest amount of heat, it is effective to apply a heat-shielding coating to the outside of the helmet cap. However, the thermal barrier coating does not have sufficient reflective performance, and has the disadvantage of significantly deteriorating performance over the years. Moreover, since the surface of the helmet body is painted, there is also the problem of deterioration in performance due to scratches and wear.

Some helmets are made by kneading reflective material such as glass beads or titanium oxide into the material of the helmet cap body. Reflective material kneaded into the resin of the helmet cap body is said to be more effective than thermal barrier paint. However, when the temperature inside the cap of a general helmet is about 75°C, the thermal insulation coating is about 66°C, the difference being about 9°C. The surface temperature is also high, and the temperature drop is not so large. Therefore, it cannot be said that materials with reflective properties, such as glass beads or titanium oxide, are kneaded into the material of the helmet cap to avoid the heat.

There is also a helmet cap with a heat shield directly attached to the inside. The direct application method utilizes the low radiation performance of the heat shield material, and when applied, the surface temperature inside the shell is greatly reduced. However, the helmet has two heat sources, the sun and another head. When the surface temperature inside the cap body is lowered, radiant heat is radiated from the head toward the cap body, this heat is reflected by the heat shielding material, and eventually returns to the user's head. Therefore, there is a problem that the user's own heat makes himself/herself hot and the head becomes stuffy.

To provide a heat shielding structure for a helmet that prevents heat from entering the inside of a helmet cap body, prevents heatstroke even in summer, and prevents the head from getting stuffy.

A heat shield structure for a helmet according to the present invention is constructed in a helmet having a helmet cap body and an inner cap provided inside the helmet cap body. Then, an inner cap having a helmet cap body with an exhaust port formed at the rear, an inner cap body having a plurality of through holes formed, and an aluminum foil provided between the helmet cap body and the inner cap against radiant heat a material with high reflectance, a plurality of air intake ports are formed between the inner portion of the helmet cap body and the peripheral edge portion of the inner cap, and a ventilation belt is formed between the inner cap body and the helmet cap body. The air outside the helmet body that is formed and sucked from the air inlet and the air inside the inner cap that is sucked from the plurality of through holes are discharged from the air outlet via the ventilation belt. .

The heat shield structure for a helmet according to the present invention has a ridge on the outer side of the inner cap body, which is formed so as to protrude from the inner cap body. A plurality of ventilation bands are formed between the inner cap body and the helmet body.

A heat shield structure for a helmet according to the present invention is characterized in that a plurality of through holes are formed so as to be inclined rearward.

A heat shield structure for a helmet according to the present invention is characterized in that cut portions are formed in front and lateral sides of a peripheral edge portion of an inner cap, and an intake port is constituted by the cut portions and an inner portion of a helmet cap body. and

A heat shield structure for a helmet according to the present invention is characterized in that a cap is attached to seal the opening of the exhaust port and the opening of the intake port.

In the heat shield structure of the helmet according to the present invention, a material with high reflectance against radiant heat such as aluminum foil is provided between the helmet cap body and the inner cap, and a ventilation belt is provided between the inner cap body and the helmet cap body. is formed, and the air inside the inner cap sucked from the outside air sucked from the plurality of air inlets formed between the inner part of the helmet cap body and the peripheral part of the inner cap and the plurality of through holes Via the ventilation belt, it is discharged from the exhaust port. Therefore, it is possible to prevent heat from entering the inside of the helmet cap body and keep the inside of the helmet cap body cool even in summer. In addition, the air flowing through the ventilation belt is discharged from the exhaust port, creating a negative pressure inside the ventilation belt. The user's head is less stuffy and cool, and the user is less susceptible to heatstroke.

In addition, in the heat shield structure of the helmet according to the present invention, since a material with a high reflectance against radiant heat such as aluminum foil is provided inside the helmet cap, it can be used without problems even with electrical specifications.

The heat-shielding structure of the helmet of the present invention completely overturns the common sense that helmets are hot, and can be expected to be highly effective in preventing heatstroke. The faster the user's movement speed, the cooler the head becomes and the less stuffy.

In addition, the heat shield structure of the helmet according to the present invention can be attached with a cap for closing the opening of the exhaust port and the opening of the intake port. By attaching and detaching the cap, the intake and exhaust ports can be opened and closed, and the temperature of the head can be adjusted. Therefore, the helmet user can maintain a comfortable state throughout the year.

1 is a diagram showing the appearance of a helmet having a heat shield structure according to an embodiment of the present invention; FIG. (a) is a front perspective view, and (b) is a rear view. FIG. 2 is a diagram showing an inner cap that constitutes a helmet having a heat shielding structure for a helmet according to an embodiment of the present invention; (a) is a front view, and (b) is a rear perspective view. Fig. 4 is a bottom view of an inner cap that constitutes the heat shield structure of the helmet according to the embodiment of the present invention; It is a figure which shows the thermal insulation structure of the helmet which concerns on embodiment of this invention. FIG. 4 is a diagram for explaining the action of the heat shield structure of the helmet according to the embodiment of the present invention; FIG. 10 is a diagram showing an inner cap for applying a heat shielding structure for a helmet according to another embodiment of the present invention to a full-face helmet;

A best mode for carrying out the present invention will be described.

Kumagaya City recorded the highest temperature in Japan at 41.4°C, and even in Tokyo, the number of summer days, midsummer days, and extremely hot days exceeds 200 days a year. That's what I feel. Many people who work outdoors wear helmets while working under the scorching sun. It is understandable that helmets are for safety purposes, but it is necessary to be aware that helmets can replace roofs in hot weather. It seems too harsh to use just one layer of plastic material to protect against heat and heatstroke.

The most important heat applied to the helmet is radiant heat from the sun, and preventing this is the most important issue. Currently, various helmet manufacturers are taking measures to prevent radiant heat.
Heat-shielding paint is applied to the outside of the helmet body, and reflective material is kneaded into the material of the helmet body. Certainly, the inside temperature of the helmet will decrease, but considering the temperature rise in the future, it cannot be said to be sufficient. In addition, secondary radiant heat radiated from the cap body irradiates the head, and the hot air that stays in the upper part of the hemisphere makes many people feel hot and stuffy, and it is undeniable that work efficiency is reduced. is.

A heat shield structure for a helmet according to the present invention is constructed in a helmet having a helmet cap body and an inner cap provided inside the helmet cap body. The heat shield structure of this helmet is provided between a helmet cap body having an exhaust port formed at the rear, an inner cap having an inner cap body having a plurality of through holes formed therein, and the helmet cap body and the inner cap. A material with high reflectance against radiant heat such as aluminum foil is used. A plurality of intake ports are formed between the inner portion of the helmet cap body and the peripheral edge portion of the inner cap, and a ventilation belt is formed between the inner cap main body and the helmet cap body, and air is drawn through the intake ports. The air outside the helmet cap body and the air inside the inner cap sucked through the plurality of through holes are discharged from the exhaust port via the ventilation belt.

Hereinafter, a heat shielding structure for a helmet and a heat shielding helmet according to the present embodiment will be described with reference to FIGS. 1 to 6. FIG.

A heat shielding structure 10 for a helmet according to this embodiment is constructed as a double structure helmet in which the inner cap 2 shown in FIG. 2 is provided inside the helmet body 1 shown in FIG. The inner cap 2 is attached to the helmet cap body 1. - 特許庁This inner cap 2 can also be provided detachably.

The helmet cap body 1 is a plastic helmet having a brim portion 1A, and as shown in FIG. The exhaust port 3 includes an upper exhaust port 3A, a left exhaust port 3B, and a right exhaust port 3C. Two upper exhaust ports 3A are formed in the horizontal direction Y, and two left exhaust ports 3B and two right exhaust ports 3C are formed in the vertical direction Z, respectively.
A material 4 having a high reflectance against radiant heat such as aluminum foil (hereinafter also referred to as a high reflectance material 4) is provided inside the helmet cap body 1 . This high reflectance material 4 is attached to the entire inner surface of the helmet cap body 1 .

As shown in FIG. 2, the inner cap 2 includes an inner cap main body 5 having a shape that conforms to the inner shape of the helmet body 1, and a ridge 6 formed on the outer side of the inner cap main body 5. there is The inner cap main body 5 is formed with through holes 7 penetrating from the outside to the inside. In this embodiment, as shown in FIG. ing. This through-hole 7 serves as a vent, and as shown in FIG. 5, is formed to be slanted rearward. A flange portion 5A is provided on the peripheral portion of the inner cap main body 5, and cut portions 5B are formed in the flange portion 5A at predetermined intervals. An intake port 8 is formed by the cut portion 5B and the inner portion of the helmet cap body 1 .

The inner cap 2 is not only a partition wall between the ventilation zone and the head area, but also an absorbing material for radiant heat radiated from the head. Therefore, it is preferable to use a material that has a high heat insulating property and can easily absorb radiant heat. The thickness may be about 3 to 10 mm, and it is not necessary to have a uniform thickness in order to increase strength and prevent interference with other members. However, it is desirable that the surface on which the air flows has no irregularities as much as possible.

The ridges 6 are formed to protrude outward from the inner cap main body 5, and are two front side protrusions formed from the front brim portion 5A in the front-rear direction X to the slightly rear side (rear upper part) of the top of the inner cap main body 5. It is composed of a ridge 6A and a rear projection 6B formed from the rear upper portion to the rear flange portion 5A. These ridges 6 are formed along the shape of the inner cap main body 5, and these front ridges 6A and rear ridges 6B are connected at the rear upper part (FIG. 2(b)).

As shown in FIG. 4, the inner cap 2 is provided approximately 2 cm above the peripheral edge of the helmet body 1 so that the brim portion 5A of the inner cap 2 is in close contact with the inner cap 2. As shown in FIG.
When the inner cap 2 is provided inside the helmet body 1 , the ridges 6 are brought into contact with the inner portion of the helmet body 1 . When the protrusion 6 is brought into contact with the inner portion of the helmet body 1, the protrusion 6 becomes a boundary wall, and three ventilation zones are formed between the helmet body 1 and the inner cap 2.例文帳に追加Specifically, the central ventilation belt surrounded by the inner portion of the helmet cap body 1, the inner cap body 5, and the two front protrusions 6A, the inner portion of the helmet cap body 1, the inner cap body 5, and the front protrusions 6A and the left side ventilation belt formed on the left side, the inner portion of the helmet cap body 1, the inner cap main body 5, the front side protrusion 6A and the rear side protrusion 6B, and the right side It is the right lateral vadose zone that is formed on the left side. In this state, the discharge port 3A corresponds to the discharge port of the central ventilation zone, the discharge port 3B corresponds to the discharge port of the left side ventilation zone, and the discharge port 3C corresponds to the discharge port of the right side ventilation zone.

The inner cap 2 is used for the major purpose of forming a ventilation band for allowing outside air to flow throughout the inside of the helmet cap body 1. - 特許庁The inner cap 2 has substantially the same shape as the inside of the helmet body 1, and is made smaller by the thickness of the ventilation belt. A brim portion 5A is formed on the lower peripheral portion of the inner cap body 5 so as to be perpendicular to the inner cap body 5, and the width of the brim portion 5A is the same as the thickness of the ventilation belt. Along the outer peripheral surface of the inner cap 2, a ridge 6 for determining the flow of air is constructed so that an air layer can be formed on the outer surface of the hemispherical inner cap 2. - 特許庁The height of the ridges 6 is the same as the height of each ventilation zone, but the height and cross-sectional shape of the ridges 6 are arbitrary and can be designed as appropriate. Therefore, when the inner cap 2 is pushed in from the lower side of the helmet body, the flange portion 5A and the ridges 6 are brought into close contact with the inner portion of the helmet body 1 and are brought into contact with each other. An isolated vent zone is formed throughout the interior of the constructed dual structure.

In order to ventilate the entire helmet cap body 1 as uniformly as possible, it is important how the air flows in the ventilation belt. In the helmet heat shield structure 10 of the present invention, the vicinity of the center of the inner cap 2, that is, the upper part of the head is defined as a central ventilation zone, and the lateral sides are defined as a right side ventilation zone and a left side ventilation zone, and are divided into three spaces. This is because the top of the head has air flowing circumferentially and in vertical spaces such as the sides, it flows over the vadose zone. In this embodiment, an example in which three ventilation zones are formed is shown, but depending on the use of the helmet, it may be divided into more spaces and the number of ventilation zones may be increased.

In this embodiment, the distance between the inner cap main body 5 and the helmet body 1, that is, the distance between the ventilation belts (the height of the ventilation belts) is designed to be 5 mm to 20 mm. The interval between the ventilation belts may be appropriately changed according to the size and shape of the helmet. Under the inner cap 2, a brim portion 5A is formed so as to be perpendicular to the main body and over the entire circumference of the outer circumference, and has a cut portion 5B of the brim portion 5A which is used as an air intake port 8. - 特許庁

An intake port 8 for sucking air into the central ventilation zone is formed in the front brim portion 5A of the inner cap 2. As shown in FIG. The size of the intake port 8 is the same as the thickness (height) of the space of the ventilation zone, which is about 5 mm to 20 mm and the width is about 5 cm to 8 cm. Of course, the intake port 8 may be large or small, but the larger the space, the more the amount of intake air.

The right side ventilation band and the left side ventilation band are formed for the purpose of cooling the side surface of the helmet cap body 1 . At least two intake ports 8 (notches) for sucking air into each side ventilation zone are formed in the brim portion 5A of the inner cap 2. As shown in FIG. The right side and left side ventilation belts cool a large space from the side of the head to the back of the head. The size of the intake port 8 is the width of the brim 5A of the inner cap 2, and is designed to be about 5 mm to 20 mm, and the length is about 3 cm to 5 cm. However, it is not limited to these sizes.

The exhaust ports 3B and 3C are preferably provided on the left and right sides of the rear portion of the helmet body 1 on the upper and lower sides below the exhaust port 3A of the central ventilation belt. Moreover, the size of the exhaust ports 3B and 3C is preferably larger than that of the intake port 8. The right and left ventilation zones are all vertical ventilation zones on the sides of the head. Therefore, since the air flowing through them flows in the upper part of the ventilation zone, it is preferable that the exhaust ports 3B and 3C are also positioned in the upper part of the ventilation zone. That is, regarding the positional relationship between the intake port 8 and the exhaust port 3 in the vertical direction Z, it is preferable that the exhaust port 3 is located above the intake port 8 .

The important points in the heat shield structure 10 for the helmet of the present invention are the following seven points.

The first is to use a highly reflective material 4 that is most effective in blocking radiant heat from the sun. Some of the high reflectance materials 4 have a reflectance of 98% or more, and it is possible to construct a high-performance heat shield structure.

Secondly, by providing an inner cap 2 inside the helmet cap body 1, it has a double structure, and between the helmet cap body 1 and the inner cap 2, air flows all around the ventilation belt (central ventilation belt, right side ventilation , left side ventilation belt) was provided. By providing the inner cap 2, the sun side and the head side, which are the two heat sources applied to the helmet cap body 1, can be considered separately.

Thirdly, since the material of the inner cap 2 is made of a heat absorbing material, the inner cap 2 has the role of absorbing the radiant heat radiated from the head. The absorbed heat becomes conductive heat or convective heat and is easily discharged.

Fourthly, the intake port 8 (notch) for supplying air to the ventilation zone is formed in the brim portion 5A of the inner cap 2 . That is, the faster the walking speed and the faster the wind speed, the faster the wind hitting the face of the user wearing the helmet cap body 1 is, the more likely it is to be sucked into the air inlet 8 . In addition, since the intake ports 8 are formed not only on the front surface but also on the side surfaces, the structure is such that it is easy to intake air not only from the front but also from all directions.

Fifth, the exhaust port 3 of each ventilation belt is formed slightly behind the top of the helmet body 1 . Since there is a difference between the height position of the intake port 8 and the height position of the exhaust port 3 in the vertical direction Z, it is easy to ventilate even in no wind. Furthermore, since the position where the exhaust port 3 is formed is high, heat does not accumulate in each ventilation zone, and the air sucked into each ventilation zone can be smoothly discharged to the outside (atmosphere) of the helmet cap body 1.例文帳に追加

Sixthly, at the top of the inner cap 2, a plurality of through holes 7 are formed so that the heat around the user's head can be discharged to the outside of the helmet body 1 through the ventilation belt. Heat and moisture are constantly emitted from the user's head, but these are also sucked into the ventilation belt through the through holes 7 and discharged to the outside of the helmet body 1 through the exhaust port 3 .

Seventhly, in order to reduce the heat and stuffiness of the user's head, it is better to draw in air with negative pressure like a vacuum cleaner instead of sending air to the head. When air is sent to the head with hot air or stuffiness, the hot air becomes entangled with the hair and becomes a turbulent state, and even if a through hole or the like is provided, it does not come off naturally. Rather, it is possible to remove the hot air from the head easily and eliminate the stuffy feeling by sucking with negative pressure. When the air from the intake port 8 (arrow F1 in FIG. 5) flows through the ventilation belt and is discharged from the exhaust port 3, the through hole 7 formed in the inner cap 2 becomes negative pressure. Heat and moisture accumulated in the air are sucked into the ventilation zone (Fig. 5: arrow F2).

It is known that it is effective to use a material with a high reflectance against radiant heat, such as aluminum foil, for helmets, but it is not used for new products due to various problems. That is, it is difficult to use. For example, the following three methods are conceivable for applying a material having a high reflectance (high reflectance material) to radiant heat, such as aluminum foil, on a helmet cap body.

The first method is to apply a high reflectance material to the outside of the helmet cap body to reflect the radiant heat outside. The reflective performance can be used as it is, and the amount of heat entering the helmet cap body is greatly reduced, so the head is less likely to get stuffy. However, many high-reflectance materials are made of metal, and they reflect brightly under the sunlight, damaging people's eyes. In addition, in order to prevent the shiny reflection, there is a method of constructing a resin film that transmits radiant heat well, but there are problems such as wrinkles and fading against future temperature rises, so it is difficult to use. . Since the high-reflectance material is metal, there is also the problem that it is difficult to use in electrical fields.

The second method is to install a plate made of a highly reflective material inside the helmet body, such as a heat shield material, with a space between the body and the body where the reflective surface is on the side of the body. That is, it is a method of reflecting the secondary radiant heat emitted from the cap body. In this method, when this space is sealed, the heat in the space is transferred to the heat shield material, resulting in a decrease in reflectance. In addition, hot air stays in this space in the upper part of the helmet, which is a hemispherical body, which tends to cause stuffiness and heat. In addition, the high reflectance material reflects the secondary radiant heat from the helmet body, but this space is highly affected by the heat conducted from the helmet body, and the temperature tends to be high. In windless conditions, heat is transferred to the highly reflective material with good thermal conductivity, and not only is it transferred to the head side, but also the reflectance decreases and the heat shielding effect decreases. Therefore, if this construction method is selected, it is necessary to provide a large intake port and an exhaust port, which may affect the strength of the helmet body.

The third method is to construct a high reflectance material inside the helmet body. This method can utilize the low radiation performance of materials with high reflectance against radiant heat such as aluminum foil as they are. For example, when the air temperature is 28°C, the temperature of the cap body of the helmet reaches 70°C, but the surface temperature of the high reflectance material is as low as about 30°C. In this state, when the head at 36.5°C is put into the cap, the radiant heat emitted from the head is reflected on the surface of the high reflectance material and returned to the head again to generate heat. Not only that, it becomes a cause of stuffiness. That is, the heat is felt by the heat of the user. Therefore, it cannot be used in this state.

The heat shield structure 10 of the helmet of the present invention has a double structure of the helmet cap body 1 and the inner cap 2, so that it is possible to achieve a significant temperature reduction even in the third method described above, and to prevent stuffiness and heat. realized that it was possible.
As described above, the high reflectance material 4 can be applied to various positions, but in the heat shield structure 10 of the helmet of the present invention, it is positioned inside the helmet cap body 1 to utilize low radiation performance. By taking advantage of the low radiant performance, it is possible to minimize the radiant heat radiated to the head side. Radiant heat is proportional to the fourth power of absolute temperature. If the temperature rises even a little, the amount of radiant heat increases rapidly and the heat shielding performance drops significantly. In the present invention, the dual structure of the helmet cap body 1 and the inner cap 2 allows the radiation side of the high reflectance material 4 to be a ventilation zone, and the radiation side can always be kept at a low temperature.

There are three major points for producing the heat-shielding helmet 20 that does not get stuffy. The heat shielding helmet 20 is a helmet having the heat shielding structure 10 of the helmet.
The first point is to block the radiant heat that gives the largest amount of heat to the head, and the best way is to use a material with high reflectance against radiant heat such as aluminum foil. If a material with high reflectance against radiant heat such as aluminum foil is used for the inside of the cap body, the low radiation performance can be used as it is.
The second point is to absorb the radiant heat emitted from the head. Helmets have two sources of heat: radiant heat from the sun and another from the head. Among them, it is important to convert the radiant heat generated from the head into conduction heat or convection heat and discharge it from the vadose zone. For this reason, it is important to select a material for the inner cap that easily absorbs heat.
The third point is to draw out moisture and heat with negative pressure in order to eliminate stuffiness. It is the same with hats, but even if you put air in your hair, the heat, moisture, and air will mix and the stuffiness will just diffuse, and it will not be possible to discharge it from the small outlet because the resistance of the opening is large. Rather, it is effective to suck moisture and heat with negative pressure like a vacuum cleaner.

The inner cap 2 has another major feature in order to make the heat shielding helmet 20 not stuffy. The reason is that the inner cap 2 is provided with a through hole 7 that serves as a ventilation port, and the heated air around the head is sucked into each ventilation zone.
For this purpose, the air staying in the head is always hot and contains a lot of moisture. If there is this through hole 7, the air that enters from the outside of the helmet 1 to the inside and rises along the head smoothly dissipates the heat and moisture to the outside of the helmet 1 (atmosphere) through the ventilation belt. ).

The heat shield structure 10 of the helmet of the present invention has the inner cap 2 and seems to separate the two heat sources, but the inner cap 2 is formed with the through hole 7, and the portion is the helmet cap. Body 1 and head are free. That is, when the high reflectance material 4 inside the helmet cap body 1 becomes low temperature, radiant heat is radiated from the head through the through holes 7 to the high reflectance material 4 and returns to the head again. In order to prevent this, the through hole 7 of the inner cap 2 is formed so as to be inclined rearward in the front-rear direction Y so that the inner portion of the helmet cap body 1 and the head portion facing each other are not connected in a straight line. there is

Of course, if the through hole 7 of the inner cap 2 is inclined in the direction of flow of the ventilation belt, the resistance to the air flow of the ventilation belt is reduced, and there is also the advantage that the air can be discharged smoothly. Further, when the resistance is small, the inside of the through hole 7 of the inner cap 2 tends to become negative pressure, and the heat and moisture in the vicinity of the head can be efficiently discharged.
Since the inner cap 2 is thin, there is no problem. If the inner cap 2 is thin, it is difficult to form the through hole 7 obliquely. In some cases, the thickness of the inner cap 2 can be increased only near the top where the through hole 7 is formed.

In the helmet heat shield structure 10 of the present invention, the through-hole 7 has a diameter of about 3 mm to 5 mm, but the shape of the through-hole 7 may be polygonal other than circular. The number of through-holes 7 is determined by the size of the helmet body 1, but at least about 5 to 10 are required near the top of the inner cap 2. In the inner cap 2 of this embodiment, a total of seven through-holes 7 having a diameter of 5 mm are provided, one in the vicinity of the center of the top portion of the inner cap 2 having a thickness of 3 mm and six at a position of 30 mm around it. The number of through-holes 7 is arbitrary, but if there are too many, there is a possibility that the air flow in the front ventilation zone will be deteriorated due to the problem of pressure when there is no wind.

A helmet shock absorbing liner is sometimes provided on the inside of the helmet. There are various helmet shock absorbing liners, but there is no problem even if they are used as the ventilation belt of the present invention. However, in order to maintain low radiation performance, it is necessary to minimize the contact area with the highly reflective material 4, which blocks conductive heat.

The high reflectance material 4 may be either an aluminum foil or an aluminum evaporated product. However, as a matter of course, a material having a high reflectance with respect to radiant heat is preferable. In the present invention, a heat-shielding material obtained by heat-sealing a material 4 having a high reflectance against radiant heat, such as aluminum foil, to a non-woven fabric is adhered so that the non-woven fabric is on the inside of the cap body. The purity of aluminum is important for the high reflectance material 4, and generally the purity is 99% or more. In the present invention, one with a purity of 99.5% or more is used. Also, as the high reflectance material 4, a material having a reflectance of 98% with respect to radiant heat is basically used. The high reflectance material 4 is mostly aluminum foil, and generally has a thickness of several microns to 10 microns. Of course, if the reflectance is high, it is possible to use other materials other than aluminum foil or vapor-deposited aluminum. In addition, the high reflectance material 4 is actually resistant to acids and alkalis and is effective against electrolytic corrosion, because the outdoor air flowing over the surface of the reflective material may contain acid or alkali components. A high-permeability resin layer is treated on the surface. By treating the surface with a high-transmittance resin layer, the reflectance becomes 90 to 95%, and corrosion of the high-reflectance material 4 can be prevented.

The inner cap 2 is not only a partition wall between the ventilation zone and the head area, but also an absorbing material for radiant heat radiated from the head. Therefore, it is preferable to use a material that has a high heat insulating property and easily absorbs radiant heat.
The thickness may be about 3 to 10 mm, and it is not necessary to have a uniform thickness in order to increase strength and prevent interference with other members. However, it is desirable that the surface on which the air flows has no irregularities as much as possible.

The present invention also proposes a heat shielding structure 10 for a helmet to which a cap for closing the air inlet 8 and the air outlet 3 is attached. In winter, if air is ventilated inside the helmet cap body, the head may cool and feel cold. If the inner cap 2 as a whole cannot be removed, a cap is used to block the intake port 8 and the exhaust port 3. The material of the cap is preferably an elastic rubber-based material, and the cap should be easily attachable and detachable.

Next, the mechanism of the heat shield structure 10 for the helmet of the present invention will be described in detail.

There are three important points in order to produce the heat-shielding structure 10 of the helmet and the heat-shielding helmet 20 that are comfortable without stuffiness.
The first point is to use a high reflectance material 4 to block radiant heat, which is the maximum heat from the outdoors. The second point is that the helmet has two heat sources, and it is important to completely block these two heat sources. The third point is to suck the hot air around the head like a vacuum cleaner instead of blowing air to eliminate the hot air and stuffiness of the head.

The first point is the radiant heat from the sun, and in order to block this, it is necessary to use a highly reflective material that can block 98% or more of the radiant heat. However, the problem is where to provide this high reflectance material. First, let us consider the case of using it on the outside of the helmet by utilizing its high reflectance performance against radiant heat. Most highly reflective materials are made of metal and have a mirror surface. When sunlight hits it, it reflects like a mirror, causing damage to the eyes of people around it and making it unusable. If a resin film with good transparency is formed by kneading a coloring agent on the outside of the high-reflectance material, a diffuse reflection structure can be expected on the surface, and it is possible to prevent shiny. However, it will be difficult to use it due to problems such as wrinkles and fading under the rising temperature in the future. Next, it is to use the low reflection performance of radiant heat and apply it to the inside of the helmet body. If you apply it to the inside, you can use it as it is shiny, and you can use the performance of the high reflectance material as it is. For example, a highly reflective material with a reflectance of 98% will emit only 2%.

However, there is a big pitfall here. It is assumed that the helmet is put on the head. Helmets have another heat source, radiant heat from the head. When the surface temperature of the high reflectance material inside the helmet cap decreases, according to the principle of heat transfer from high temperature to low temperature, radiant heat is radiated from the head toward the helmet cap, and this radiant heat is transferred to the high reflectance material. is reflected on the surface of the head and returns to the head again. As a result, it can be said that this situation has the opposite effect. This is also the difficulty of using reflective materials.

The heat shielding structure 10 of the helmet of the present invention solves the above problem, and has a double structure using the helmet cap body 1 and the inner cap 2 having substantially the same shape as the helmet cap body 1 inside thereof. .

The inner cap 2 is made smaller than the helmet body 1 by the thickness of the ventilation band, but has substantially the same shape as the helmet body 1. - 特許庁A brim 5A having a thickness of a ventilation belt is provided in the direction perpendicular to the helmet cap body 1 around the entire circumference of the peripheral portion of the helmet cap body 1. - 特許庁Further, on the outer side of the inner cap 2, a ridge 6 having a height equivalent to the thickness of the ventilation belt is formed so as to divide the outer portion of the inner cap 2 into three parts.
When the inner cap 2 is pushed in from the lower side of the helmet cap body 1, the entire inner cap 2 is fully inserted into the helmet cap body 1, and the entire circumference of the collar 5A and the ridges 6 are separated from the helmet cap body 1. In close contact. In the present invention, three ventilation zones having a constant air layer thickness are formed between the helmet cap body 1 and the inner cap 2 .

The second point is that the double structure makes it possible to separate the helmet body 1 side, which receives heat from the sun, and the head side, which receives heat from the body temperature. A ventilation zone is provided in the entire space between 2.
Originally, if the radiation side of the high reflectance material 4 is a narrow space, the temperature of this space tends to rise. That is, according to Stefan Boltzmann's law that the amount of radiation is proportional to the fourth power of absolute temperature, the temperature rises rapidly. As a result, the amount of radiation increases rapidly and the heat shielding effect is greatly reduced. In the present invention, the radiation side of the high-reflectance material 4 is constantly cooled by constantly flowing air through each ventilation zone, thereby preventing deterioration of the heat shielding effect.

In the heat shield structure 10 for a helmet of the present invention, there are three ventilation zones: a central ventilation zone located above the head from the front of the helmet cap body 1, a right side ventilation zone and a left side ventilation zone located on both sides of the helmet cap body 1. is formed. The air intake port 8 of the central ventilation belt is formed in the brim 5A of the inner cap 2 in front of the face inside the helmet cap body 1, and the air that hits the face naturally flows upward and flows from the front air intake port 8 to the central ventilation belt. air is sucked into Therefore, the faster the walking speed, the more the amount of air taken in from the intake port 8 increases, and the entire central ventilation zone can be cooled.
The air entering from the intake port 8 moves over the head and is discharged from the exhaust port 3 provided slightly behind the top of the helmet cap body 1. - 特許庁Since the central ventilation zone is the most important part of cooling the head, it is preferable that the air flow even in almost no wind. If the exhaust port 3 is located on the lower side of the helmet cap body 1, a heat pool is formed in the central ventilation belt, which causes stuffiness.

In addition, the exhaust port 3 is formed slightly behind the top of the head. The purpose of this is to prevent heat from accumulating at the top even when the intake air volume is small. If the exhaust port 3 is formed at a low position, heat will be accumulated in the head while the air is stationary.
Since the shape of the exhaust port 3 is provided along the ventilation zone, the central ventilation zone is basically a horizontal opening. The shape of the exhaust port 3 may be round, square, rectangular or the like, giving priority to the strength of the cap body. However, it is preferable that the opening area of the exhaust port 3 is larger than that of the intake port 8 .

The right side ventilation band and the left side ventilation band are formed for the purpose of cooling the side surface of the helmet cap body 1 . It is preferable to provide at least two side air intake ports 8 in each flange portion 5A of the inner cap 2. As shown in FIG. There are at least two ventilation belts on the right side and left side, because the large space from the side of the face to the back of the head is cooled, and the force of the wind blowing from the front cannot be used very much.
The exhaust ports 3B and 3C are preferably provided in the vertical direction Z on both sides from the center of the back of the head below the exhaust port 3A of the central ventilation zone. The shape and size of the exhaust ports 3B and 3C may be determined according to the size and purpose of the helmet, and it is important to prioritize the strength of the cap body.
The right side ventilation zone and the left side ventilation zone are entirely side surfaces of the head and serve as ventilation zones in the up-down direction Z. Therefore, since the air flowing through these ventilation zones flows above the ventilation zones, it is preferable that the exhaust ports 3B and 3C are also positioned above the ventilation zones.

The third point is aimed at a helmet that does not get stuffy.
When air is sent to the head, it seems that the head is cool, but in reality, the air, hot air, and humidity are entangled in the hair, and since sufficient exhaust treatment cannot be performed, it stays around the head and becomes stuffy. does not change much.

The heat shield structure 10 of the helmet of the present invention prevents stuffiness by sucking hot air and moisture from the head. Therefore, a plurality of through holes 7 are formed in the vicinity of the top of the inner cap 2 so as to pass through the head portion side and the ventilation belt side. These through-holes 7 are inclined in the direction of flow of the ventilation belt (toward the rear) so as not to give resistance to the air flowing through the ventilation belt and so that the air on the head side is smoothly sucked into the ventilation belt. It is desirable to be formed so that
When the air flows through the ventilation belt, the inside of the ventilation belt becomes negative pressure, and the hot air and moisture remaining around the head move to each ventilation belt through the through holes 7, and finally the helmet cap body 1. It is discharged outside. Although there is heat generated from the head even when there is no wind, the hot air around the head at this time moves from the through hole 7 of the inner cap 2 to each ventilation zone and is released to the outside. As a result, the vent zone in front of the face becomes negative pressure, and outside air is taken in from the intake port 8, so that the radiation side of the high reflectance material 4 can be continuously cooled.

In winter or on cold days, it can be cold when the air flows over your head. Therefore, a rubber cap is used to close the intake port 8 and the exhaust port 3, and it can be attached or detached with one touch, so that it can be used according to the user's favorite temperature.

Next, the inner cap used for the full-face helmet will be explained.
The full-face inner cap 30 is provided inside the full-face helmet. As shown in FIG. 6, the inner cap 30 has a plurality of ridges 32 formed on the outside of an inner cap main body 31 shaped like a full-face helmet. A flange portion 33 is provided along the opening of the inner cap main body 31 , and an intake port 34 is formed in the flange portion 33 . External air that has flowed in from the intake port 34 passes through the ventilation belt formed by being sandwiched between the ridges 32. - 特許庁

A full-face helmet should cover the entire face from the front of the chin to the side of the neck. Therefore, it is preferable to newly increase the area around the sun visor and the area around the chin in addition to the normal helmet ventilation belt. Therefore, it is preferable to insert a plurality of protrusions 32 of the ventilation belt in the horizontal direction on the side surface of the face. Of course, in order to provide the intake port 34, an exhaust port must be formed, but the concept is the same as that of a normal product, and there is no problem. However, since it involves speed, there is no problem even if the intake port and exhaust port are smaller than a normal helmet. Also, a helmet used for moving at high speed, such as a motorcycle, is affected by the wind if the air intake port 34 is too large, so it is necessary to consider the opening area.

[Test 1]
An opening (exhaust port) with a horizontal width of 4 cm and a height of 1 cm was provided at a position 5 cm behind the top of the helmet cap body. A trapezoidal boundary wall (protrusion) with a height of 1 cm was provided inside the helmet body from a position about 8 cm on both sides from the center of the front to surround the rear side of the aforementioned opening. A heat shielding material THB-CX (manufactured by Nippon Thermal Insulation Co., Ltd.) was pasted on the entire surface of the cap inside the boundary wall. Furthermore, the head side surface was covered with a polyethylene sheet made of paper with a thickness of 3 mm so that the boundary wall was completely hidden and in close contact. This made it possible to form a ventilation zone of 1 cm in height, and the air inlet at the bottom of the helmet was 1 cm wide and 5 cm long.
Two general helmets of the same shape as this test helmet were placed at a position 300 mm in front of the 1000 W far-infrared heater so that the outside of the cap body became a heat source. The inner temperature of a general helmet cap body and the inner temperature of the polyethylene sheet of the present invention were measured by thermography. Room temperature was 25°C.

[Result 1]

[Discussion 1]
(1) The inside temperature of the helmet body of a general helmet was raised from 31.4°C to 83.0°C and 51.6°C, but the inside temperature of the heat shield helmet was only 5°C from 27.6°C to 32.9°C. The temperature rose only 0.3°C.
(2) When the internal temperature of a general helmet is 83.0°C, the internal temperature of the heat shield helmet is 32.9°C, which is much lower than the body temperature, and the temperature difference with the general helmet is 50.1°C. Ta. At this time, when I touched the polyethylene sheet inside the heat shield helmet with my hand, I felt a cold sensation, which proved to be extremely effective.

[Test 2]
The helmet with the inner cap was placed horizontally, and the test was conducted by simulating the condition of actual use. Heat was applied from two 500W halogen lamp floodlights from 300 mm above the helmet, and the surface of the helmet was heated to 75°C. The vent hole (through hole) of the inner cap had a diameter of 5 mm, and was provided at 1 point at the top, 6 points at a 30 mm circumference, and 4 points at the back of the head for a total of 11 points. In addition, in order to check whether air flows from the inside of the inner cap through the ventilation belt, smoke was blown from the vicinity of the center of the inside of the inner cap with an incense stick. The temperature was measured with a contact thermo recorder. Room temperature was 25°C.

[Result 2]

[Discussion 2]
(1) Even if the surface temperature of the cap body is 75.8°C, the internal temperature is 39.2°C, which is as low as 36.6°C. Of course, even if you put your hand inside, you won't feel the heat at all.
(2) Smoke rises even in windless conditions, demonstrating good air permeability.

As described above, the present embodiment has been described, but in addition to this, it is possible to select the configurations mentioned in the above embodiments or to change them to other configurations as appropriate without departing from the gist of the present invention. . In this embodiment, an example is shown in which the material 4 having a high reflectance against radiant heat such as aluminum foil is provided on the entire inner surface of the helmet cap body 1. The material 4 may be provided on the entire outer surface of the inner cap 2 .

1 Helmet cap body 1A Collar 2 Inner cap 3 Exhaust port 3A Upper exhaust port 3B Left exhaust port 3C Right exhaust port 4 Material with high reflectance against radiant heat such as aluminum foil (high reflectance material)
5 Inner cap main body 5A Collar 5B Notch 6 Projection 6A Front projection 6B Rear projection 7 Through hole (vent)
8 Intake port 10 Heat shielding structure of helmet 20 Heat shield helmet 30 Inner cap for full face 31 Inner cap main body 32 Projection 33 Collar 34 Intake port X Front-back direction Y Left-right direction Z Up-down direction

Claims (5)

A heat shield structure for a helmet constructed in a helmet having a helmet cap body and an inner cap provided inside the helmet cap body,
the helmet body having a first exhaust port formed in the rear upper part and a second exhaust port formed in the rear and lower than the first exhaust port ;
the inner cap having an inner cap body in which a plurality of through holes are formed;
A material with high reflectance against radiant heat such as aluminum foil provided between the helmet cap body and the inner cap,
A plurality of air intake ports are formed between the inner portion of the helmet cap body and the peripheral portion of the inner cap,
Outside the inner cap main body, there is a ridge formed so as to protrude from the inner cap body, and the ridge includes two front ridges and a ridge connected to the front ridge. and one rear projection, and the front projection and the rear projection are brought into contact with the helmet cap body to provide a space between the inner cap main body and the helmet cap body. , a central ventilation belt surrounded by one of the front ridges and the other front ridges, one side ventilation belt surrounded by the one front ridges and the rear ridges, the other of the The other side ventilation belt surrounded by the front rib portion and the rear rib portion is formed,
Of the air outside the helmet cap that is taken in through the air intake port and the air inside the inner cap that is taken in through the plurality of through holes, the air flowing through the central ventilation belt is discharged through the first exhaust port. and the air flowing through the one side side ventilation zone and the other side side ventilation zone is discharged from the second exhaust port ,
A heat shield structure for a helmet characterized by: The front rib portion and the rear rib portion are configured to be continuous,
The second exhaust port is formed above the intake port, and the second exhaust port is composed of a right second exhaust port and a left second exhaust port, and the air flowing through the one side ventilation belt is the right side air vent. From the second exhaust port, the air flowing through the other side side ventilation belt is discharged from the left second exhaust port,
The heat shield structure for a helmet according to claim 1, characterized in that: wherein the plurality of through-holes are formed so as to be slanted toward the rear;
The heat shield structure for a helmet according to claim 1 or 2, characterized in that: Incisions are formed in front and lateral sides of the peripheral edge of the inner cap,
wherein the intake port is configured by the cut portion and the inner portion of the helmet cap body,
The heat shield structure for a helmet according to claim 1 or 2, characterized in that: A cap is attached to close the openings of the first exhaust port and the second exhaust port, and the opening of the intake port,
The heat shield structure for a helmet according to claim 1 or 2, characterized in that:

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